1/2 c. butter
1 1/2 c. graham cracker crumbs
1 (14 oz.) can sweetened condensed milk
1 (12 oz.) pkg. semi sweet chocolate chips
1 c. peanut butter chips

Preheat oven to 350 degrees. In 13"x9" pan, melt butter in oven. sprinkle crumbs evenly over butter; pour sweetened condensed milk evenly over crumbs. Top with chips, press down firmly. Bake 25 to 30 minutes. Cool. Cut into bars.